From M2HSS to CPM-M4 — Hightech Peasant Knives and why I love them.

I always wanted a Old Timer feeling on a Nasa tool. Grandpa’s knife update, a workhorse with the latest tech but asking for the same care as the previous 20th century generation used to provide to their pocket knives.

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Back in the 90’s I was running after the Benchmade BM800HS AFCK and Mini AFCK BM812HS. (Yes, Sal Glesser was also involved in its design…) They were modern knives with titanium linerlocks but providing a High Speed Tool Steel a tungsten low chromium allow: M2 Speedstar.

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wp-image-1626599986The Nimravus in M2, and pictured : the mini Nimravus BM45HS.
It has been used a lot, isn’t it ?
The “M” M2 stands for molybdenum with 5% of it in the alloy and with 0.95% of carbon, 2% vanadium and 6% of Tungsten it should have been named T2.
“M2 is the “standard” and most widely used industrial HSS. It has small and evenly distributed carbides giving high wear resistance, though its decarburization sensitivity is a little bit high. After heat treatment, its hardness is the same as T1, but its bending strength can reach 4700 MPa, and its toughness and thermo-plasticity are higher than T1 by 50%. It is usually used to manufacture a variety of tools, such as drill bits, taps and reamers.”
For more info: https://en.wikipedia.org/wiki/High-speed_steel

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Cuts in the wood were very special and left some kind of patina with M2 blades: it’s soft. Could it be the fine grain of the alloy, the tungsten carbids ? You can find set of chisels and woodturning tools in M2, some of high quality made in Sheffield, UK, but their main marketing quotes is that they last 6 times more than carbon steel which means nothing IMHO unless they use very soft low carbon steel for comparaison.
As M2HSS is not used anymore my present favorite knives are often made of CPM M4.

When the AFCK M2HSS was provided, its blade was coated. But where was the fun ? Patina is a much better coating in my book. The idea was to give to a very thin pointy knife more strenght as the current production was using mainly ATS-34. IMHO they had killed two birds with one stone by upgrading the steel to a non-stainless-steel.

wp-image-258869882Bud Nealy Pesh Kabz or Travel Knife in M2 the coating has been removed and the Mantra 2.

I was very happy with the Caly 3 in Super Blue Steel (until I lost her) but it was not as good as HS steel. Very angry edge for sure but not lasting like M2 or of course the hyper CPM M4. So for good measure I have invested in a Endura with HAP40: “Spyderco C10WDP Endura 4 Folding Knife 3.8″ HAP40/SUS410 Satin Plain Blade, Mahogany Pakkawood Handles, KnifeCenter Exclusive”.  I’m not in business with Howard of the Knifecenter but back in the 90’s I had designed their Logo !
HAP40 is an Hitachi steel which looks a lot like CPM M4 but with added 8% Cobalt and it is technically exactly what a High Tech Peasant Knife should be.
More to come when I will review it next week !

 

 

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3 Comments on “From M2HSS to CPM-M4 — Hightech Peasant Knives and why I love them.

  1. Pingback: Starmate C55 — Blast from the Past. – NemoKnivesReview

  2. Pingback: Spyderco C10WDP Endura 4 HAP40/SUS410 Satin Plain Blade, Mahogany Pakkawood Handles KnifeCenter Exclusive — Wooden Wonder Perfection ! – NemoKnivesReview

  3. Pingback: Endura HAP40 blade and Pakkawood handle, sanded to my taste. – NemoKnivesReview

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